We are a high volume retailer of AI brand diving sensors, assuring that replacement sensors ordered from Dive Gear Express are always among the freshest available.

The PSR-11-39-MD, is by far the most popular "R-22D" style with Molex 3-pin connector, used in the Dive Rite O2ptima, Poseidon Se7en & Discovery VI, Hollis Prism2 & Explorer MK2, KISS Classic/GEM and upgraded KISS Sport, Hammerhead, rEvo, Liberty and many other brands of rebreathers.

The Poseidon brand Sensor is used for both the MKVI and Se7en rebreathers and is the same as the PSR-11-39-MD except for the label.

Specialty sensors for other rebreathers include:

The PSR-11-15-2D is used in the Draeger Oxy Gauge and Dolphin rebreathers.

The PSR-11-39-APD is used in the iQsub XCCR, APD Inspiration and APD Evolution rebreathers.

The PSR-11-39-JD is used in the Hollis Explorer MK1 and VR Sentinel rebreathers.

The PSR-11-39-JJ is used in the JJ rebreather.

The PSR-11-39-MD1, depending on the revision level of the electronics, is used in Biomarine MK15/MK15.5/CCR-1000 rebreathers, and Steam Machines SM1000/SM1600 rebreathers.

The PSR-11-39-MDSX or PSR-11-39-MDSX1, depending on the revision level of the electronics is used in the Submatix SCR 100 rebreather.

The PSR-11-39-MEG is used in the ISC Megalodon rebreathers.

The PSR-11-39-MHD is a special version of the PSR-11-39-MD which provides a slightly higher mV range.

The PSR-11-33-NM1, depending on the revision level of the electronics, is used in Biomarine MK15/MK15.5/CCR-1000 rebreathers, and Steam Machines SM1000/SM1600 rebreathers.

The PSR-11-39-TME is used in some homebuilt rebreathers.

The PSR-11-39-XD is used in the SF2 rebreather.

The PSR-11-75-DNM is used in the Lungfish Dive Systems rebreather.

Many rebreather manufacturers do not wish to deal with global retail sales of oxygen sensors and publish generic sensor specifications suitable for their units, allowing the market to determine supply and price. Some rebreather manufacturers prefer to tightly control supply and price, stating only their own private label sensor is approved for use in their unit. In our experience there is an Analytical Industries diving grade oxygen sensor PSR model for nearly every rebreather currently being sold for recreational diving, but some rebreather manufacturers do not allow us to publish a cross reference for their units. Regardless, verification and validation of specific oxygen sensors for use in rebreather applications is the responsibility of the equipment user and/or original equipment manufacturer.

Oxygen Sensor Life in Rebreathers

When any new oxygen sensor is removed from the sealed package, it can
take anywhere from a few minutes to several hours for it to acclimate
and the millivolt output to stabilize. We recommend waiting as long as practical before calibrating your rebreather with a freshly opened sensor. Also,
as oxygen sensors reach end-of-life they can become unpredictable,
causing problems that are sometimes difficult to diagnose. Because
oxygen sensors are so critical to the operational safety of rebreathers,
we recommend discontinuing the use of oxygen sensors that have been
in-service over 12 months, or have a total age of over 18 months.

The expiration date printed on some sensors is not a guarantee they can remain in-service until that date; it is a caution against use after that date. Oxygen sensors are a consumable like a battery; their service life can vary considerably depending on usage, oxygen exposure and environmental factors. Three conditions are particularly notable for shortening the life of an oxygen sensor to much less than 12 months, regardless of brand.

Impact - Inside the oxygen sensor are tiny wires and seals
that are very fragile. Sensors subjected to g-force shocks explains why
a new sensor will come out of the package DOA; high, low or zero millivolt output; or with erratic behaviors.

Heat - The warmer the sensor, the shorter the life. That can
happen during shipping or storage, especially in tropical climates. Their life can also be significantly shortened when the
rebreather sits in the sun and gets very hot.

Prolonged Oxygen Exposure - Leaving elevated oxygen mixtures
in the breathing loop, which often happens following a calibration, will
substantially reduce the life of a sensor. Heavy use of your rebreather
will also shorten the life of the sensor.

to read Oxygen Sensor Handling - Best Practices

WARNING

Dive Gear Express has not done any verification or validation of rebreather oxygen sensors and disclaims any responsibility and liability for the use of oxygen sensors in rebreather applications. Verification and validation of specific oxygen sensors for use in rebreather applications is the responsibility of the equipment user and/or original equipment manufacturer.